Luminescent glass element, producing method thereof and luminescing method thereof

ABSTRACT

The present invention relates to a luminescent glass element comprising a luminescent glass substrate, which a metal layer is positioned on a surface thereof. The metal layer is provided with a metal microstructure. The luminescent glass substrate has composite oxides represented as the following formula: aM 2 O.bY 2 O 3 .cSiO 2 .dPr 2 O 3 , wherein M represents alkali metal element, a, b, c and d are, by mol part, 25-60, 1-30, 20-70 and 0.001-10 respectively. The present invention also provides a producing method of the luminescent glass element and a luminescing method thereof. The metal layer is positioned on the luminescent glass substrate, thereby improving luminescence efficiency of the luminescent glass substrate. The luminescent glass element can be used in luminescent devices with ultrahigh brightness or high-speed operation.

TECHNICAL FIELD

The present invention relates to luminescent materials, and particularlyto a luminescent glass element with a glass substrate as the luminescentmaterial, a producing method thereof and a luminescing method thereof.

BACKGROUND

Traditional materials for luminescent substrates include fluorescentpowder, nanocrystals, glasses, etc. In comparison to the fluorescentpowder and nanocrystals, the glasses are transparent and hard, and havegood chemical stability and good optical properties, and can be readilymachined into a variety of products with different dimensions andshapes, for example, monitors or lighting sources with variousdimensions and shapes.

For example, in vacuum microelectronics field, field emission displaystypically utilize the luminescent glasses as luminescent units thereof,and are widely applied in light and display fields and attract extensiveattentions from research organizations at home and abroad. The operatingprinciple of the field emission displays is described as follows: apositive voltage is applied by an anode facing toward field emissioncathode arrays (hereinafter referred to as FEAs) to form an acceleratingfield in vacuum condition, electrons emitted from cathodes areaccelerated to impact luminescent materials on the anode and excited theluminescent materials to illuminate. The field emission displays havebroad operating temperatures (−40° C.-80° C.), short response time (<1ms), compact structure, low power consumption, and satisfy a demand forgreen environmental protection. The materials such as phosphor powder,luminescent glasses and luminescent films can be used as the luminescentmaterials in the field emission displays. However, these materials havea natural shortage of low luminescence efficiency, which significantlyconstrains application of the field emission displays, particularly inlighting field.

SUMMARY

Therefore, in accordance with an aspect of the present invention, aluminescent glass element is provided, which has good lighttransmittance, high uniformity, high luminescence efficiency, goodstability and compact structure. A producing method of the luminescentglass element is also provided, which can reduce cost and simplify theprocess.

Further, in accordance with another aspect of the present invention, aluminescing method of the luminescent glass element is provided, whichcan be readily operated, and has a high reliability and an improvedluminescence efficiency for the luminescent material.

A luminescent glass element comprises a luminescent glass substrate,which a metal layer is positioned on a surface of. The metal layer isprovided with a metal microstructure. The luminescent glass substratehas composite oxides represented as the following formula:

aM₂O.bY₂O₃ .cSiO₂ .dPr₂O₃

Wherein M represents alkali metal element, a, b, c and d are, by molpart, 25-60, 1-30, 20-70 and 0.001-10 respectively.

A producing method of a luminescent glass element comprises thefollowing steps:

Preparing a luminescent glass substrate, the luminescent glass substratehas composite oxides represented as the following formula:aM₂O.bY₂O₃.cSiO₂.dPr₂O₃, wherein M represents alkali metal element, a,b, c and d are, by mol part, 25-60, 1-30, 20-70 and 0.001-10respectively;

Forming a metal layer positioned on a surface of the luminescent glasssubstrate; and

Performing an annealing treatment in vacuum for the luminescent glasssubstrate and the metal layer to provide the metal layer with a metalmicrostructure, cooling, and then forming the luminescent glass element.

Further, a luminescing method of a luminescent glass element comprisesthe following steps:

Obtaining a luminescent glass element according to the producing methoddescribed above; and

Emitting cathode rays to the metal layer, forming surface plasmonsbetween the metal layer and the luminescent glass substrate underexcitation of the cathode rays, and inducing luminescence from theluminescent glass substrate.

The present invention uses a metal layer positioned on the luminescentglass substrate, which has a metal microstructure and can induceformation of surface plasmons at the interface between the luminescentglass substrate and the metal layer under excitation of the cathoderays. By means of surface plasmon effect, internal quantum efficiency ofthe luminescent glass substrate is significantly increased, namely,spontaneous radiation of the luminescent glass substrate is enhanced.Accordingly, the luminescence efficiency of the luminescent glasssubstrate is significantly improved. By this way, the present inventionprovides a solution for the problem of low luminescence efficiency ofthe traditional luminescent materials. Therefore, according to theluminescing method of the luminescent glass element, when emittingcathode rays to the metal layer, surface plasmons can be formed betweenthe metal layer and the luminescent glass substrate under the excitationof the cathode rays to enhance luminescence efficiency of theluminescent glass substrate and improve luminescent reliability thereof.Further, according to the producing method of the luminescent element,the desired luminescent glass element can be obtained by forming a metallayer on the luminescent glass substrate and then annealing it,accordingly simplifying the producing method, reducing cost, andpossessing wide and promising practical applications.

DRAWINGS

The present invention will be explained below in detail with referenceto the following embodiments and the accompanying drawings, in which:

FIG. 1 is a schematic view of a structure of a luminescent glass elementin accordance with an embodiment of the present invention;

FIG. 2 is a flow chart of a producing method of the luminescent glasselement in accordance with the embodiment of the present invention;

FIG. 3 is a flow chart of a luminescing method of the luminescent glasselement in accordance with the embodiment of the present invention;

FIG. 4 shows luminescence spectrums of a luminescent glass element ofExample 1 and a luminescent glass without a metal layer as a comparison,wherein the luminescence spectrum excited by cathode rays is measured atan exciting acceleration voltage of electron beam of 5 KV.

DETAILED DESCRIPTION

Objects, advantages and technical solutions of the present inventionwill be explained below in detail with reference to the followingembodiments and the accompanying drawings. But it will be understoodthat the following description of the embodiment(s) is merely to explainthe present invention and is no way intended to limit the presentinvention.

A luminescent glass element 10 in accordance with an embodiment of thepresent invention is shown in FIG. 1, which includes a luminescent glasssubstrate 13 and a metal layer 14 positioned on a surface of theluminescent glass substrate 13. The metal layer 14 is provided with ametal microstructure. The metal microstructure is sometimes referred toas micro-nano structure. Further, the metal microstructure is aperiodic,namely, composed of metal crystals in a random array.

The luminescent glass substrate 13 has composite oxides represented asthe following formula: aM₂O.bY₂O₃.cSiO₂.dPr₂O₃, wherein M representsalkali metal element, a, b, c and d are, by mol part, 25-60, 1-30, 20-70and 0.001-10 respectively. The luminescent glass substrate 13 containspraseodymium oxide, which make the luminescent glass emit light and havegood performance in the substrate with such compositions. Theluminescent glass substrate 13 also has good light transmittance.

Wherein, the metal layer 14 can be made of metals with good chemicalstability, for example, some metals which are difficult to be oxidizedor corroded, or common metals. The metal is preferably at least one ofgold, silver, aluminum, copper, titanium, iron, nickel, cobalt,chromium, platinum, palladium, magnesium, zinc, more preferably at leastone of gold, silver, aluminum. The metal type in the metal layer may bea single metal thereof or a composite metal thereof. The composite metalmay be an alloy of two or more above metals. For example, the metallayer 14 may be an alloy layer composed of silver and aluminum, or analloy layer composed of gold and aluminum, wherein weight percents ofsilver or gold are preferably more than 70%. The metal layer 14 has apreferred thickness of 0.5 nm to 200 nm, more preferably 1 nm to 100 nm.

The alkali metal element M is preferably at least one of Na, K, Li.

The luminescent glass element 10 is used as a luminescent element andcan be widely applied in luminescent devices with ultrahigh brightnessor high-speed operation, for example, field emission displays, fieldemission light sources, large-size billboards or the like products.Taking a field emission display as an example, a positive voltage isapplied by an anode facing toward field emission cathode arrays to forman accelerating field, electrons are emitted from a cathode, namely,cathode rays 16 are emitted onto the metal layer 14, and then surfaceplasmons are formed between the metal layer with the microstructure andthe luminescent glass substrate. By means of surface plasmon effect, theinternal quantum efficiency of the luminescent glass substrate 13 issignificantly increased, namely, spontaneous radiation of theluminescent glass substrate is enhanced. Accordingly, luminescenceefficiency of the luminescent glass substrate is significantly improved.By this way, the present invention provides a solution for the problemof low luminescence efficiency of the traditional luminescent materials.Furthermore, since the metal layer is formed on a surface of theluminescent glass substrate 13, a homogeneous interface is formedbetween the entire metal layer and the luminescent glass substrate 13,thereby improving uniformity of luminescence.

Referring to FIGS. 1 and 2, illustrating a flow chart of a producingmethod of the luminescent glass element in accordance with theembodiment of the present invention, which includes the following steps:

S01: preparing a luminescent glass substrate, wherein the luminescentglass substrate 13 has the compositions and mol parts described above,namely, includes composite oxides represented as the following formula:

aM₂O.bY₂O₃.cSiO₂.dPr₂O₃, wherein M represents alkali metal element, a,b, c and d are, by mol part, 25-60, 1-30, 20-70 and 0.001-10respectively;

S02: forming a metal layer positioned on a surface of the luminescentglass substrate; and

S03: performing an annealing treatment in vacuum for the luminescentglass substrate and the metal layer to provide the metal layer with ametal microstructure, cooling, and then forming the luminescent glasselement.

Wherein, preparation of the luminescent glass substrate 13 is describedin detail as follows: taking analytically pure alkali metal salt,silicon dioxide and 99.99% Y₂O₃, Pr₆O₁₁ as main raw materials, weightingthe raw materials according to mol part ratios of respectivecompositions in the chemical formula of aM₂O.bY₂O₃.cSiO₂.dPr₂O₃ of theluminescent glass substrate, mixing and melting the raw materials at1200 centigrade degrees to 1500 centigrade degrees for one to fivehours, cooling to room temperature, annealing at 600 centigrade degreesto 1100 centigrade degrees for one to twenty hours in a reductiveatmosphere, and then obtaining the luminescent glass substrate. Further,the glass substrate may be cut and polished to have a certain size,thereby obtaining the desired luminescent glass substrate.

As structures described above, the metal layer 14 may be made of metalswith good chemical stability, for example, some metals which aredifficult to be oxidized or corroded, or common metals. The metal ispreferably at least one of gold, silver, aluminum, copper, titanium,iron, nickel, cobalt, chromium, platinum, palladium, magnesium, zinc,more preferably at least one of gold, silver, aluminum. The metal typein the metal layer may be a single metal thereof or a composite metalthereof. The metal layer 14 has a preferred thickness of 0.5 nm to 200nm, more preferably 1 nm to 100 nm. The alkali metal element M ispreferably at least one of Na, K, Li.

In step S02, the metal layer is formed by sputtering or evaporationdepositing metal on the surface of the luminescent glass substrate. StepS03 is described in detail as follows: after forming the metal layer onthe surface of the luminescent glass substrate, annealing the metallayer at 50 centigrade degrees to 650 centigrade degrees for fiveminutes to five hours, and then naturally cooling to room temperature.Wherein, the annealing temperature is preferably 100 centigrade degreesto 500 centigrade degrees, and annealing period is preferably fifteenminutes to three hours.

Referring to FIGS. 1 and 3, illustrating a flow chart of a luminescingmethod of the luminescent glass element in accordance with theembodiment of the present invention, which includes the following steps:

S11: obtaining a luminescent glass element 10 according to the producingmethod described above; and

S12: emitting cathode rays 16 to the metal layer 14, forming surfaceplasmons between the metal layer and the luminescent glass substrate 13under excitation of the cathode rays 16, and inducing luminescence fromthe luminescent glass substrate 13.

The luminescent glass element 10 has features such as structure andcompositions as described above. In practical application, for example afield emission display or a lighting source, under a vacuum condition, apositive voltage is applied by an anode facing toward field emissioncathode arrays to form an accelerating field, the cathode rays 16 areemitted from a cathode, under excitation of the cathode rays 16,electron beams firstly penetrate through the metal layer 14 and thenexcite the luminescent glass substrate 13 to emit light. During thisprocess, surface plasmon effect is generated at the interface betweenthe metal layer 14 and the luminescent glass substrate 13. By means ofthe effect, the internal quantum efficiency of the luminescent glasssubstrate is significantly increased, namely, spontaneous radiation ofthe luminescent glass substrate is increased, accordingly significantlyimproving luminescence efficiency of the luminescent glass substrate.

Surface plasmon (hereinafter referred to as SP) is a kind of wavepropagating along an interface between metal and dielectric, itsamplitude exponentially attenuates along a distance facing away from theinterface. When varying surface structure of the metal, properties,dispersion relation, excitation mode and coupling effect of surfaceplasmon polaritons (hereinafter referred to as SPPs) significantly vary.SPPs can induce electromagnetic field which can constrain propagation oflight wave in a structure with a subwavelength dimension and cangenerate and control electromagnetic radiation from optical frequency tomicrowavelength band, accordingly achieving active manipulation tooptical propagation. Therefore, the present embodiment utilizesexcitation property of SPPs to increase the intensity of luminescentglass substrate in an optics state and improve spontaneous radiationvelocity of the luminescent glass substrate. Further, by means of thecoupling effect of surface plasmons, when the luminescent glasssubstrate emits lights, coupling resonance effect is generatedaccordingly, thereby significantly increasing internal quantumefficiency of the luminescent glass substrate and improving luminescentefficiency of the luminescent glass substrate.

Various compositions of the luminescent glass element and the producingmethod thereof, as well as properties thereof are described below by anumber of exemplary examples.

Example 1

A luminescent glass, 30Na₂O.9.8Y₂O₃.60SiO₂0.2Pr₂O₃ (the numbers beforethe oxides represent mol parts of the respective oxides, the same isbelow), is selected, which is formed as a substrate according to theabove-described producing method and has a size of 1×1 cm², and asurface of which is polished. Then, a silver metal layer with athickness of 2 nm is deposited on the surface of the glass by amagnetron sputtering device. The glass with the silver metal layer isplaced into a vacuum environment with a vacuum degree of lower than1×10⁻³ Pa to perform an annealing treatment at 300 centigrade degreesfor half an hour, and then is cooled to room temperature, accordinglyobtaining the luminescent glass element of this Example.

Cathode rays generated by an electron gun bombard the luminescent glasselement of Example 1 and then a luminescence spectrum, as shown in FIG.4, is generated. A curve 11 in the figure represents a luminescencespectrum from a glass without a silver layer, and a curve 12 in thefigure represents a luminescence spectrum from the luminescent glasselement of this Example. As seen from the FIG. 4, since a surfaceplasmon effect is generated between the metal layer and the glass, incomparison to a luminescent glass without any metal layer, theluminescent glass element of this Example 1 has a 2.2 times luminescentintensity of that of the luminescent glass without any metal layer,namely improving luminescent characteristics. Luminescence spectrums ofthe following Examples are essentially similar to that of Example 1, andluminescent glass elements thereof have essentially similar luminescentintensity effect to Example 1, so we will not go into the detail of thefollowing Examples.

Example 2

A luminescent glass, 25Na₂O.15Y₂O₃O.45SiO₂O.5Pr₂O₃, is selected, whichis formed as a substrate according to the above-described producingmethod and has a size of 1×1 cm², and a surface of which is polished.Then, a gold metal layer with a thickness of 0.5 nm is deposited on thesurface of the glass by a magnetron sputtering device. The glass withthe gold metal layer is placed into a vacuum environment with a vacuumdegree of lower than 1×10⁻³ Pa to perform an annealing treatment at 200centigrade degrees for an hour, and then is cooled to room temperature,accordingly obtaining the luminescent glass element of this Example.

Example 3

A luminescent glass, 27Na₂O.1Y₂O₃O.70SiO₂.0.001Pr₂O₃, is selected, whichis formed as a substrate according to the above-described producingmethod and has a size of 1×1 cm², and a surface of which is polished.Then, an aluminum metal layer with a thickness of 200 nm is deposited onthe surface of the glass by a magnetron sputtering device. The glasswith the aluminum metal layer is placed into a vacuum environment with avacuum degree of lower than 1×10⁻³ Pa to perform an annealing treatmentat 500 centigrade degrees for five hours, and then is cooled to roomtemperature, accordingly obtaining the luminescent glass element of thisExample.

Example 4

A luminescent glass, 32Na₂O.5Y₂O₃.65SiO₂.0.1Pr₂O₃, is selected, which isformed as a substrate according to the above-described producing methodand has a size of 1×1 cm², and a surface of which is polished. Then, amagnesium metal layer with a thickness of 100 nm is deposited on thesurface of the glass by a beam evaporation device. The glass with themagnesium metal layer is placed into a vacuum environment with a vacuumdegree of lower than 1×10⁻³ Pa to perform an annealing treatment at 650centigrade degrees for five minutes, and then is cooled to roomtemperature, accordingly obtaining the luminescent glass element of thisExample.

Example 5

A luminescent glass, 35Na₂O.10Y₂O₃O.50SiO₂O.2Pr₂O₃, is selected, whichis formed as a substrate according to the above-described producingmethod and has a size of 1×1 cm², and a surface of which is polished.Then, a palladium metal layer with a thickness of 1 nm is deposited onthe surface of the glass by a beam evaporation device. The glass withthe palladium metal layer is placed into a vacuum environment with avacuum degree of lower than 1×10⁻³ Pa to perform an annealing treatmentat 100 centigrade degrees for three hours, and then is cooled to roomtemperature, accordingly obtaining the luminescent glass element of thisExample.

Example 6

A luminescent glass, 38Na₂O.12Y₂O₃O.43SiO₂.0.5 Pr₂O₃, is selected, whichis formed as a substrate according to the above-described producingmethod and has a size of 1×1 cm², and a surface of which is polished.Then, a platinum metal layer with a thickness of 5 nm is deposited onthe surface of the glass by a beam evaporation device. The glass withthe platinum metal layer is placed into a vacuum environment with avacuum degree of lower than 1×10⁻³ Pa to perform an annealing treatmentat 450 centigrade degrees for fifteen minutes, and then is cooled toroom temperature, accordingly obtaining the luminescent glass element ofthis Example.

Example 7

A luminescent glass, 28Na₂O.10Y₂O₃.68SiO₂.2Pr₂O₃, is selected, which isformed as a substrate according to the above-described producing methodand has a size of 1×1 cm², and a surface of which is polished. Then, aniron metal layer with a thickness of 20 nm is deposited on the surfaceof the glass by a beam evaporation device. The glass with the iron metallayer is placed into a vacuum environment with a vacuum degree of lowerthan 1×10⁻³ Pa to perform an annealing treatment at 50 centigradedegrees for five hours, and then is cooled to room temperature,accordingly obtaining the luminescent glass element of this Example.

Example 8

A luminescent glass, 35Li₂O.18Y₂O₃O.55SiO₂O.6Pr₂O₃, is selected, whichis formed as a substrate according to the above-described producingmethod and has a size of 1×1 cm², and a surface of which is polished.Then, a titanium metal layer with a thickness of 10 nm is deposited onthe surface of the glass by a beam evaporation device. The glass withthe titanium metal layer is placed into a vacuum environment with avacuum degree of lower than 1×10⁻³ Pa to perform an annealing treatmentat 150 centigrade degrees for two hours, and then is cooled to roomtemperature, accordingly obtaining the luminescent glass element of thisExample.

Example 9

A luminescent glass, 40Li₂O.22Y₂O₃O.40SiO₂.8Pr₂O₃, is selected, which isformed as a substrate according to the above-described producing methodand has a size of 1×1 cm², and a surface of which is polished. Then, acopper metal layer with a thickness of 50 nm is deposited on the surfaceof the glass by a beam evaporation device. The glass with the coppermetal layer is placed into a vacuum environment with a vacuum degree oflower than 1×10⁻³ Pa to perform an annealing treatment at 200 centigradedegrees for 2.5 hours, and then is cooled to room temperature,accordingly obtaining the luminescent glass element of this Example.

Example 10

A luminescent glass, 50Li₂O.25Y₂O₃.30SiO₂.9.5Pr₂O₃, is selected, whichis formed as a substrate according to the above-described producingmethod and has a size of 1×1 cm², and a surface of which is polished.Then, a zinc metal layer with a thickness of 150 nm is deposited on thesurface of the glass by a beam evaporation device. The glass with thezinc metal layer is placed into a vacuum environment with a vacuumdegree of lower than 1×10⁻³ Pa to perform an annealing treatment at 350centigrade degrees for half an hour, and then is cooled to roomtemperature, accordingly obtaining the luminescent glass element of thisExample.

Example 11

A luminescent glass, 60Li₂O.30Y₂O₃.40SiO₂.10Pr₂O₃, is selected, which isformed as a substrate according to the above-described producing methodand has a size of 1×1 cm², and a surface of which is polished. Then, achromium metal layer with a thickness of 120 nm is deposited on thesurface of the glass by a beam evaporation device. The glass with thechromium metal layer is placed into a vacuum environment with a vacuumdegree of lower than 1×10⁻³ Pa to perform an annealing treatment at 250centigrade degrees for two hours, and then is cooled to roomtemperature, accordingly obtaining the luminescent glass element of thisExample.

Example 12

A luminescent glass, 33K₂O.7Y₂O₃.58SiO₂0.7 Pr₂O₃, is selected, which isformed as a substrate according to the above-described producing methodand has a size of 1×1 cm², and a surface of which is polished. Then, anickel metal layer with a thickness of 40 nm is deposited on the surfaceof the glass by a beam evaporation device. The glass with the nickelmetal layer is placed into a vacuum environment with a vacuum degree oflower than 1×10⁻³ Pa to perform an annealing treatment at 80 centigradedegrees for four hours, and then is cooled to room temperature,accordingly obtaining the luminescent glass element of this Example.

Example 13

A luminescent glass, 26K₂O.4Y₂O₃.69SiO₂0.9Pr₂O₃, is selected, which isformed as a substrate according to the above-described producing methodand has a size of 1×1 cm², and a surface of which is polished. Then, acobalt metal layer with a thickness of 180 nm is deposited on thesurface of the glass by a beam evaporation device. The glass with thecobalt metal layer is placed into a vacuum environment with a vacuumdegree of lower than 1×10⁻³ Pa to perform an annealing treatment at 400centigrade degrees for an hour, and then is cooled to room temperature,accordingly obtaining the luminescent glass element of this Example.

Example 14

A luminescent glass, 45K₂O.8Y₂O₃.48SiO₂.1.5Pr₂O₃, is selected, which isformed as a substrate according to the above-described producing methodand has a size of 1×1 cm², and a surface of which is polished. Then, asilver and aluminum metal layer with a thickness of 80 nm is depositedon the surface of the glass by a beam evaporation device. Wherein,contents of silver and aluminum in the metal layer are 80% by weight and20% by weight respectively. The glass with the silver layer is placedinto a vacuum environment with a vacuum degree of lower than 1×10⁻³ Pato perform an annealing treatment at 380 centigrade degrees for 2.5hours, and then is cooled to room temperature, accordingly obtaining theluminescent glass element of this Example.

Example 15

A luminescent glass, 36K₂O.16Y₂O₃.52SiO₂.4Pr₂O₃, is selected, which isformed as a substrate according to the above-described producing methodand has a size of 1×1 cm², and a surface of which is polished. Then, asilver and aluminum metal layer with a thickness of 15 nm is depositedon the surface of the glass by a beam evaporation device. Wherein,contents of silver and aluminum in the metal layer are 90% by weight and10% by weight respectively. The glass with the silver and aluminum metallayer is placed into a vacuum environment with a vacuum degree of lowerthan 1×10⁻³ Pa to perform an annealing treatment at 180 centigradedegrees for 3.5 hours, and then is cooled to room temperature,accordingly obtaining the luminescent glass element of this Example.

Example 16

A luminescent glass, 55K₂O.3Y₂O₃.62SiO₂.7Pr₂O₃, is selected, which isformed as a substrate according to the above-described producing methodand has a size of 1×1 cm², and a surface of which is polished. Then, agold and aluminum metal layer with a thickness of 35 nm is deposited onthe surface of the glass by a beam evaporation device. Wherein, contentsof gold and aluminum in the metal layer are 80% by weight and 20% byweight respectively. The glass with the gold and aluminum metal layer isplaced into a vacuum environment with a vacuum degree of lower than1×10⁻³ Pa to perform an annealing treatment at 70 centigrade degrees for1.5 hours, and then is cooled to room temperature, accordingly obtainingthe luminescent glass element of this Example.

Example 17

A luminescent glass, 58K₂O.6Y₂O₃.35SiO₂.9Pr₂O₃, is selected, which isformed as a substrate according to the above-described producing methodand has a size of 1×1 cm², and a surface of which is polished. Then, agold and aluminum metal layer with a thickness of 60 nm is deposited onthe surface of the glass by a beam evaporation device. Wherein, contentsof gold and aluminum in the metal layer are 90% by weight and 10% byweight respectively. The glass with the gold and aluminum metal layer isplaced into a vacuum environment with a vacuum degree of lower than1×10⁻³ Pa to perform an annealing treatment at 600 centigrade degreesfor 4.5 hours, and then is cooled to room temperature, accordinglyobtaining the luminescent glass element of this Example.

In the above-described embodiments, the metal layer 14 with amicrostructure is positioned on the luminescent glass substrate 13, andthe metal layer 14 can induce a formation of the surface plasmons at theinterface of the metal layer 14 and the luminescent glass substrate 13under excitation of the cathode rays 16. By means of the surface plasmoneffect, the internal quantum efficiency of the luminescent glasssubstrate is significantly increased, namely, spontaneous radiation ofthe luminescent glass substrate is increased, accordingly significantlyincreasing luminescence efficiency of the luminescent glass substrate.Therefore, in the luminescing method of the luminescent glass element,by emitting cathode rays 16 to the metal layer 14, surface plasmons areformed between the metal layer 14 and the luminescent glass substrate 13to increase luminescence efficiency of the luminescent glass substrate13 and improve luminescent reliability thereof.

In the producing method of the luminescent glass element of theembodiment of the present invention, the luminescent glass element 10can be obtained by forming a metal layer 14 on the luminescent glasssubstrate 13 and then annealing it, accordingly simplifying theproducing method, reducing cost, and possessing wide and promisingpractical applications. Particularly, it can be widely applied inluminescent devices with an ultrahigh brightness or a high-speedoperation, for example, field emission displays.

The above-mentioned is only the preferred embodiments of the presentinvention, but places no limit to the invention. Therefore, anymodification, equivalent replacement and improvement etc on the basis ofthe spirit and principle of invention shall be within the protectivescope of the present invention.

1. A luminescent glass element, comprising: a luminescent glasssubstrate; and a metal layer positioned on a surface of the luminescentglass substrate; the metal layer being provided with a metalmicrostructure, the luminescent glass substrate having composite oxidesrepresented as the following formula:aM₂O.bY₂O₃ .cSiO₂ .dPr₂O₃, wherein M represents alkali metal element, a,b, c and d are, by mol part, 25-60, 1-30, 20-70 and 0.001-10respectively.
 2. The luminescent glass element of claim 1, wherein thealkali metal element is at least one of Na, K, Li.
 3. The luminescentglass element of claim 1, wherein metal of the metal layer is at leastone of gold, silver, aluminum, copper, titanium, iron, nickel, cobalt,chromium, platinum, palladium, magnesium, zinc.
 4. The luminescent glasselement of claim 3, wherein the metal of the metal layer is at least oneof gold, silver, aluminum.
 5. The luminescent glass element of claim 1,wherein the metal layer has a thickness of 0.5 nm to 200 nm.
 6. Aproducing method of a luminescent glass element, comprising thefollowing steps: preparing a luminescent glass substrate, theluminescent glass substrate having composite oxides represented as thefollowing formula: aM₂O.bY₂O₃.cSiO₂.dPr₂O₃, wherein M represents alkalimetal element, a, b, c and d are, by mol part, 25-60, 1-30, 20-70 and0.001-10 respectively; forming a metal layer on a surface of theluminescent glass substrate; and performing an annealing treatment invacuum for the luminescent glass substrate and the metal layer toprovide the metal layer with a metal microstructure, cooling, and thenforming the luminescent glass element.
 7. The producing method of claim6, wherein the preparation of the luminescent glass substrate comprisesthe following steps: taking alkali metal salt, silicon dioxide, Y₂O₃ andPr₆O₁₁ as raw materials according to respective mol parts thereof,mixing and melting the raw materials at 1200 centigrade degrees to 1500centigrade degrees, cooling, annealing at 600 centigrade degrees to 1100centigrade degrees in a reductive atmosphere, and then obtaining theluminescent glass substrate.
 8. The producing method of a luminescentglass element of claim 6, wherein the metal layer is formed bysputtering or evaporation depositing metal on the surface of theluminescent glass substrate.
 9. The producing method of a luminescentglass element of claim 6, wherein the annealing treatment in vacuum isperformed at 50 centigrade degrees to 650 centigrade degrees for fiveminutes to five hours.
 10. The producing method of a luminescent glasselement of claim 6, wherein metal of the metal layer is at least one ofgold, silver, aluminum, copper, titanium, iron, nickel, cobalt,chromium, platinum, palladium, magnesium, zinc.
 11. The producing methodof a luminescent glass element of claim 6, wherein metal of the metallayer is at least one of gold, silver, aluminum.
 12. The producingmethod of a luminescent glass element of claim 6, wherein the metallayer has a thickness of 0.5 nm to 200 nm.
 13. A luminescing method of aluminescent glass element, comprises the following steps: obtaining aluminescent glass element according to the producing method according toclaim 6; and emitting cathode rays to the metal layer, forming surfaceplasmons between the metal layer and the luminescent glass substrateunder excitation of the cathode rays, and inducing luminescence from theluminescent glass substrate.
 14. The luminescing method of claim 13,wherein metal of the metal layer is at least one of gold, silver,aluminum, copper, titanium, iron, nickel, cobalt, chromium, platinum,palladium, magnesium, zinc.
 15. The luminescing method of claim 13,wherein metal of the metal layer is at least one of gold, silver,aluminum.
 16. The luminescing method of claim 13, wherein the metallayer has a thickness of 0.5 nm to 200 nm.
 17. The luminescing method ofclaim 13, wherein the metal layer is formed by sputtering or evaporationdepositing metal on the surface of the luminescent glass substrate. 18.The luminescing method of claim 13, wherein the annealing treatment invacuum is performed at 50 centigrade degrees to 650 centigrade degreesfor five minutes to five hours.